Book excerpt: Renewable energy sources are currently a particularly pressing need as we all have become addicted to the usage of electrical energy. The extraction of fossil fuels has to be reduced as they are depleting at an ever-increasing rate, which is due to the increase in population and the subsequent rapid urbanization. As a consequence, research into both power-saving electrical appliances and feasible energy sources is ongoing. Thus, it is necessary that future energy sources should be reliable, renewable and eco-friendly. This book includes discussion about renewable energy resources like wind and solar power plants and a comparison between renewable and non-renewable energy sources with valid data from various case studies. In addition, the impact of fossil-fuelled power plants on the environment is discussed and real-time datum from the energy audit of solar power plant are given. The advantages of renewable resources over conventional ones are also explored in detail.